Interchangeable-cylinder pump.



' o. 746,344., I PATENTED BBQ-8,1903.

- G. A. KROHN} INTERGHANGEABLE CYLINDER PUMP. APPLIOATIOY FILED MAR, 6.1903 no MODEL.

UNITED STATES Patented December 8, 1903.

PATENT OFFICE.

eUs AvE A. KROHN, *o 'OOARLSEGOLD, CALIFORNIA.

l NTERGHANG EABLE-CY LIN DER PUM P.

srncmrcn'riolv f min par of Letters Patent No. 746,344, dated December8, 1903.

Application filed. Marchfi, 1903. Serial No. 146,505. (NomodelJ .To allwhom it may concern.-

Be it known that I, GUSTAVE A. KROHN, a citizen ofthe United States,residing at Ooarsegold, county of Madera, State of California, haveinvented an I mprovementin Interchangeable-Oylinde'rPumps; and Iherebydeclare the following to be a full, clear, and exact description of thesame.

My invention relates to improvements in pumps.

It consists in a construction by which the interior portion WlthlD'WhlChthe plunger struct the pump-that the interior cylinder within which thepump-plunger reciprocates may be easily changed and di'flerent sizes ofcylinders substituted to suit variations in pressure or capacity.

The cylinder when in place is held rigidly as an integral part oftheapparatus.

As shown in the accompanying drawings, A is an outer cylinder havinginlet-passages 2 and 3, connecting with an exterior inletchannel 4, andoutlet-passages 5 and 6, conneeting with an outlet-channel 7. Theseinlet and outlet passages are here shown as screw-threaded and adaptedto receive the independent valveseats, with relation to which the inletand outlet valves are designed to operate. These valves may be of anysuitable or wellknown construction, such as puppet valves; but I do notclaim either the valves or seats as being any part of my presentinvention. In line axially with these inlet and outlet'valves areopenings 8, which are closable by suitable screw-caps, and theseopenings serve for the purpose of introducing or removing the valves andtheir seats, as

they are all inline with each other.

The cylinder A is made in two parts, as shown,these parts beingseparable substantially at or near the center and in aplane transverseto the axis of the cylinder. They are provided with lugs 9, andscrew-studs, as at 10, serve to unite the two parts together. When thestuds are removed, the outer end is in the form of a cylindricalcap,'which may be removed. The opposite end is connected with thesteam-cylinder or other motor and has a stufling-box, as at 10, throughwhich a piston-rod passes and connects with aplu nger adapted toreciprocate in the interior portion of the pn mp-cylinder,as will behereinafter described. The opposite'end of the rod, extending through asimilar stuffing-box into the pressure-cylinder, connects with thepiston, which is reciprocable in that cylinder and through which motionistransmitted to the pump-plunger.

The interior cylinder 12 is shorter than the two-part exteriorcylinderand has flanges or extensions, as at 13, which extend outwardlyfrom the cylinder; 12 and register with the outer portion ofthe cylinderA and the parts containing the inlet and outlet passages, as shown.These extensions where they coincide with the inlet and outlet passageshave openings formed ,through them, so that the water may freely passthrough the inlet-passage to both the inlet-valves and in the samemanner may freely pass through the outletvalves to the outlet-passage.

The inner cylinder 12 has a length sufliciently less than the interiorlength of the outer cylinder to allow liquid when being pumped to passfreely into either of its ends after entering the inlet-valves. Thediaphragm or flange 13 of the inner cylinderis ap-' proximately centralbetween the ends of the cylinder and formsaclosure or diaphragm betweenthe outside of the inner cylinder and the interior of the outercylinder. When the parts 7 are secured together, a tight joint is madebetween this flange or diaphragm and the contiguous contact parts of theouter cylinder by means of suitable sheet-packing, and when the partsare bolted together the whole forms a rigid .structure. The diatoophragm intermediate between the two ends of the outer cylinder andprojecting from the inner cylinder prevents any passage of liquid beingpumped from one end to the other of the outer cylinder.

The operation will then be as follows: The plunger being reciprocatedwithin the inner cylinder will first draw through the inlet-passage andthe inlet-valve at one end of the main cylinder, and this liquid willfreely enter the open end of thecylinder 12, from which end the plungeris at that instant receding. Upon the reversal of the movement of theplunger the liquid in the cylinder 12 will be forced out, and as theinlet-valve closes the outlet-valve opens into the discharge-passage. Atthe same time the opposite inlet-valve will be opened by the vacuumproduced by the receding piston, and that end of the cylinder will befilled during thetime that the Water is being expelled from the oppositeend of the cylinder, thus producing a double-acting pumpin the usualmanner. If it be found desirable to change the size of the innercylinder to suit different requirements of capacity or of pressure ascompared with the power-cylinder, it is only necessary to remove theconnecting bolts or studs and the outer end of the cylinder A, when theinner cylinder 12, with its flanges, can be removed and another one ofdifierent size, but having similar flanges, can beinserted into itsplace. When thiscylinderis thus removed,the valves, valve-seats, and allparts connected with the outer cylinder are easily accessible, and theplunger is also in full View and may be repacked or changed to suit thediiferent capacity of the cylinder 12 without in any Way disturbing anyother part of the apparatus.

I preferably form the plunger with a continuous Wind of packing, so thatit can be packed without the use ofa packing-hook and with ease anddespatch by reason of its being fully exposed.

The plunger is provided with a spiral groove ends 16.

or channel, as at 15, said groove or channel terminating in abuttingends 16 equal in thickness to one turn of the'spiral. The packing 17 isof any flexible class and has a transverse form and area correspondingwith the A suflicient length of this packing is used to complete therequired turns of the spiral between the ends 16, against which thepackingends abut, thus obviating all joints lengthwise of the piston.

Having thus described my invention, what I claim, and desire to secureby Letters Patout, is-

1. The combination in apunip of an exterior cylinder formed in two partsseparable transversely to the axis, each of said parts provided withinlet and outlet valves and waterpassages; an interior cylinder of lesslength and diameter than the outer cylinder and having a radialdiaphragmor flange approxi' mately central between its ends and lying between thetwo parts of the outer cylinder at a point between each pairofinlet andoutlet valves; and studs for securing the two parts of the outercylinder and the inner cylinder together.

2. The combination in a pump of an outer and inner cylinder said innercylinder of less diameter and length than the outer cylinder and havinga radial diaphragm or flange approximately central between its ends, andsaid outer cylinder formed oftwo parts each including an inlet-valve, anoutlet-valve and a Water-passage said valves removable with saidsections and said sections provided with lugs and capped openingsaffording access to the valves, and studs engaging the lugs and securingthe parts together.

In witness whereof I have hereunto set my hand.

GUSTAVE A. KROHN.

Witnesses:

S. H. NoURsE, JESSIE G. BRODIE.

